His tactic this time? Kerviel doesn't deny his bad trades, but he is saying everyone else at SocGen did it too! From Reuters—

Questioned by the presiding judge and SocGen's lawyers over one of his hidden trades - a 5 billion-euro bet in March 2007 that the German stock market would fall - Kerviel told a Paris court that all his colleagues knew what he was doing and that hiding bets was widespread.

"Everyone did it...Everyone knew and saw what I was doing," said Kerviel, who wore an open-necked light shirt and became increasingly animated during his testimony.

With the prospect of of three years in prison waiting for him, Kerviel probably figured he could afford to lose a few friends by throwing his former co-workers under the bus.